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Grok Build 0.1 vs GPT 5.1 Codex Max

At a glance

xAI's agentic build model for autonomous software engineering.

256K ctx$1.00/$2.00 per M

Extended-context coding model for large codebase operations.

400K ctx$1.25/$10.00 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-06-15
Cheaper64%
Coding
Real-World Coding70.8%
Agentic
Terminal Tasks—Task Horizon—
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-07-10
Coding
Real-World Coding—
Agentic
Terminal Tasks60.4%Task Horizon2.7h
Specs
256K
Context
16K
Max output
May 2026
Released
400K
Context
128K
Max output
Dec 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input20%$1.00/M tokens
Output80%$2.00/M tokens
Cache read$0.20/M tokens
Web search50%$0.005/search
Live pricing, shown before you run
Input$1.25/M tokens
Output$10.00/M tokens
Cache read37%$0.13/M tokens
Web search$0.01/search
Chat with Grok Build 0.1Go to model
Chat with GPT 5.1 Codex MaxGo to model
Frequently Asked Questions: Grok Build 0.1 vs GPT 5.1 Codex Max▼

Which is better, Grok Build 0.1 or GPT 5.1 Codex Max?

▼

Both Grok Build 0.1 and GPT 5.1 Codex Max are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Grok Build 0.1 or GPT 5.1 Codex Max?

▼

Grok Build 0.1 has a lower blended cost. Grok Build 0.1: $1.00 input / $2.00 output. GPT 5.1 Codex Max: $1.25 input / $10.00 output.

Which has a larger context window, Grok Build 0.1 or GPT 5.1 Codex Max?

▼

GPT 5.1 Codex Max has a larger context window: Grok Build 0.1 supports 256K tokens vs GPT 5.1 Codex Max at 400K tokens.

Do both Grok Build 0.1 and GPT 5.1 Codex Max support vision?

▼

Yes, both Grok Build 0.1 and GPT 5.1 Codex Max support vision/image input.

What are the key differences between Grok Build 0.1 and GPT 5.1 Codex Max?

▼

Grok Build 0.1 and GPT 5.1 Codex Max have similar overall capabilities. The main differences lie in pricing, context window size, and provider-specific strengths. Use this comparison page to review all metrics side by side.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Grok Build 0.1 and GPT 5.1 Codex Max for free on idapt.app to see which performs better for your specific needs.

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